Calculating-machine.



No. 705,838. Patnted July 29, I902.

c. HAMANN.

CALCULATING MACHINE.

(Application filed Mar. 28, 1902.)

(No Model.)

I IN Vmrm. WIT/ Ems.- 16 W 60mm M l w Uranus UNITED STATES PATENTQEEICE.

OHRISTEL HAMANN, OF FRlEDENAU-BERLIN, GERMANY, ASSIGNOR TO ERNSTSCHUSTER, OF BERLIN, GERMANY.

CALCULATBNG WACHINE.

SPECIFICATION formingpart of Letters Patent No. 705,838, dated July 29,1902,

Application filed March 28, 1902. Serial No. 100,433. (No model.)

To all whomit may concern:

Be it known that I, OHRIs'rE'L HAMANN, en gineer, a citizen of theKingdom of Prussia, and a resident of Friedenau-Berlin, Germany (whosepost -office address is Hedwigstrasse 17,) have invented certain new anduseful Improvements in Calculating-Machines of which the following is aspecificationi The calculating-machines now in general use permit theaddition of the products of different multiplications, without, however,giving the results of the single multiplications which are to be added.In many cases it is of importance to know these single products as wellas their sum.

The present invention relates to an improvement in calculating-machinesof known construction by means of which not only the sum of the resultsof the single multiplications, but also their single products, may beobtained, and for that purpose the calculat ing-machines must beprovided with another registering device, :hich is to be arranged insuch a way that only one registering mechanism is actuated on by meansof the setting mechanism and that during the manipulation of forming aproduct both registering devices are completely independent from eachother, the connection being only established in the moment when theproduct formed in the one of the registering mechanisms is to betransmitted to the other one for the purpose of forming the sum of twoproducts.

As will be seen from the accompanying drawing, in which is shown asectional view through the machine, the transmission to the secondregistering device is not effected from the setting-disk, but in thefollowing way,

In the drawing, 1 is the calculating or set ting disk, 3 one of theregistering devices, 5 the other one. The number to which thesetting-disk is set is transmitted by the turning of the same by meansof intermediate gear 2 to the registering device 3, the drums of whichshow after the manipulation has been performed the result of samebeneath the windows 6. In setting back these registering-drums to zerothey execute correspond-- ing rotations to their initial or iteropositionsi If the ten-toothed registering-drum 5 shows, for example. oneof the numbers 9 8 7 it is turned back in setting the mechanism to zerocorrespondingly through nine eight seven inter vals until it reaches itszero position. This setting back to zero may be done by any mechanismknown for that purpose and is now utilized for the summing up of thesingle products obtained by different subsequent manipulations of themechanism. For that purpose a second registering mechanism 5 is arrangedparallel to the former one 3, the numerals of the same being visiblethrough the windows 7 in the casing of the machine. Theseregistering-drums bear a cam-wheel having ten teeth said cam -wheelgearing with an intermediate toothed wheel 4, which may either gear alsowith the toothed wheel 3 or be out of gear with the same. If saidintermediate wheel i gears with 3 in begin ning the setting back to zeroof 3, it evident that the registering-drums 5 will be rotated in thesame sense through an angle equal to that through which the drums 3 arero tated.

If the result of a subsequent calculating operation is visible in thewindows 6 and said result is to be added to that visible in the secondregistering work, setting at the same time the registering-drums 8 backto Zero the wheels tare brought to gear with 3 be fore beginning thesetting to Zero. It is readily understood that means must be provided inthe second registering mechanism for transmitting the teens; but thisdevice may be of any known construction. Y

As already mentioned, ordinarily the toothed wheels i are not in gearwith the registering work 3, and the result of any calculation is onlytransmitted to the latter. If the same is to be transmitted to thesecond registering worl; and added to the result visible in the windows7, 8 and i are to be thrown into gear. Means of any convenient description may be used for that purpose. In the case shown in the drawing itis done in the following way; The shaft on which the intermediatetoothed wheels 4 rotate has its bearings in the ends of two levers 8,the pivot of which is formed by the shaft of the toothed wheels 5, ahandle imitating the form of a bent lever 9 serving for raising andlowering the lever B. n pressing down the free end The throwing intogear by the depression of lever 9 and the setting back to zero of theupper registering-works is repeated as many times as different items areto be added. The throwing into and out of gear of the tworegistering-works may also be automatically done in any convenient way.

What I claim is- In a calculating-machine, the combination with theregistering-drum having a gear connected therewith and a second gearmeshing with said first-named gear for driving the drum, of a secondregistering-drum having a gear connected therewith, a link pivoted atthe axis of said second drum, an idler-gear journaled in the free end ofsaid link and meshing with said last-named gear, and a bell-crank leverhaving one arm adapted to bear on the under side of said link and itsother arm adapted to serve as an operating" handle, substantially asdescribed.

In testimony whereof I ai'lix my signature in presence of two witnesses.

CI-IEISTEL IIAMANN. Witnesses:

WOLDEMAR HAUPT,

HENRY HASPER.

